Short man-made cellulose fibers (TENCEL^® fibers) were used to mechanically reinforce thermal superinsulating silica aerogels. The aerogels were prepared via two drying techniques: ambient pressure drying and with supercritical CO₂, in both cases resulting in monolithic non-brittle materials. The influence of fiber length and concentration on the thermal conductivity and flexural properties of both types of composite aerogels was evaluated. Thermal conductivity in room conditions varied from 0.015 to 0.018 W/m K; it slightly increased with fiber concentration but remained in superinsulation domain. The importance of fiber percolation concentration for synthesizing monolithic ambient pressure dried composite aerogels was demonstrated. Contrary to neat silica aerogels, non-brittle behavior was observed for composite aerogels regardless of the drying method when reinforced with cellulose fibers. Macroscopic short cellulose based fibers are efficient and easy to use for preparing robust, monolithic, thermal superinsulating aerogel materials.

短的人造纤维素纤维（TENCEL ^®纤维）被用来机械地加强热superinsulating二氧化硅气凝胶。通过两种干燥技术制备气凝胶：常压干燥和超临界CO ₂干燥，这两种情况都会导致整体的非脆性材料。评估了纤维长度和浓度对两种类型的复合气凝胶的热导率和挠曲性能的影响。室温下的热导率从0.015到0.018 W / m K不等；它随纤维浓度的增加而略有增加，但仍处于超绝热域。证明了纤维渗滤浓度对于合成整体式常压干燥复合气凝胶的重要性。与纯净的二氧化硅气凝胶相反，当用纤维素纤维增强复合气凝胶时，无论干燥方法如何，都观察到了非脆性行为。宏观的基于短纤维素的纤维是高效且易于使用的，用于制备坚固，整体的热超绝热气凝胶材料。